package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;


import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;


@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
@Value("${reggie.path}")
    private String basePath;

    /**
     * 上传文件
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件,需要转存到指定位置,否则本次请求完成后临时文件会被删除掉
        log.info(file.toString());

        //原始文件名字
        final String originalFilename = file.getOriginalFilename();
        final String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID查询生成文件名,防止文件名称重复
        final String fileName = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        final File dir = new File(basePath);
        if (!dir.exists()){
            //目录不存在,则需要创建
            dir.mkdirs();

        }
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws Exception {
        //输入流,通过输入流读取文件
        final FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
        //输出流,通过输出流将文件写给浏览器
        final ServletOutputStream outputStream = response.getOutputStream();
        response.setContentType("image/jpeg");

        int len=0;
        byte[] bytes=new byte[1024];
        while ((len=fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }
        //关闭资源
        outputStream.close();
        fileInputStream.close();

    }

}
